// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_RASTER_SYNCHRONOUS_TASK_GRAPH_RUNNER_H_
#define CC_RASTER_SYNCHRONOUS_TASK_GRAPH_RUNNER_H_

#include "cc/raster/task_graph_runner.h"
#include "cc/raster/task_graph_work_queue.h"

namespace cc {

// Implements a TaskGraphRunner which runs synchronously. This runner only runs
// tasks when RunUntilIdle is called.
class CC_EXPORT SynchronousTaskGraphRunner : public TaskGraphRunner {
public:
    SynchronousTaskGraphRunner();
    ~SynchronousTaskGraphRunner() override;

    // Overridden from TaskGraphRunner:
    NamespaceToken GenerateNamespaceToken() override;
    void ScheduleTasks(NamespaceToken token, TaskGraph* graph) override;
    void WaitForTasksToFinishRunning(NamespaceToken token) override;
    void CollectCompletedTasks(NamespaceToken token,
        Task::Vector* completed_tasks) override;

    // Runs all pending tasks from all namespaces.
    void RunUntilIdle();

    // For test use only.
    bool RunSingleTaskForTesting() { return RunTask(); }

private:
    // Returns true if there was a task to run.
    bool RunTask();

    // Stores the actual tasks to be run, sorted by priority.
    TaskGraphWorkQueue work_queue_;
};

} // namespace cc

#endif // CC_RASTER_SYNCHRONOUS_TASK_GRAPH_RUNNER_H_
